The JBO Thread Ring Gauge (Go) for UNC left-hand threads is a precision inspection tool designed to quickly verify external thread diameters. Ideal for machinists, quality control teams, engineers, and maintenance staff, it ensures components meet UNC left-handed, 2A specifications with reliable, repeatable results.

Crafted from hardened steel, this ring gauge delivers durable, long-lasting performance in busy workshop environments. Its Go-side design provides a straightforward go/no-go check, helping you identify compliant parts at a glance and keep production moving without guesswork.

• Go UNC Left-Hand verification: Quickly confirm external thread diameters against the No. 2 x 56, 2A UNC left-hand spec, delivering fast pass/fail results to streamline quality checks.
• Hardened steel construction: Built to withstand daily use, resisting wear and maintaining accurate measurements for reliable, long-term performance.
• User-friendly conformance indication: Designed for easy identification of properly formed threads, reducing inspection time and improving consistency across parts and assemblies.

Incorporating the JBO Thread Ring Gauge into your QC workflow helps you make confident decisions faster, reduce downtime from mismatches, and ensure components fit properly in assemblies. Its durable construction and clear go/no-go assessment support consistent results, helping your team maintain high-quality standards with efficiency.